Electric heater



- P. RAUCHFUSS ELECTRIC HEATER Filed Nov. 1, 1922.

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-Paul Rauchfuss,

His Attorney Patented Feb. 17, 1925.

{UNITED VSTATES'PATENT OFFICE.

P'AUL RAUGHFUSS, OF BERLIN, GERMANY, ASSIGNOR TO GENERAL ELECTRIC COK- PANY, A CORPORATION OF NEW YORK.

ELECTRIC HEATER.

Application filed flovember 1, 1922. Serial No. 59am.

ore specifically, the heating here in question is electric heating with st tionary electrodes having movable insu ating tubes placed over them, in which are inserted special displacing members of insulating material. According to the invention, it is intended in the regulation of such an electric heating arrangement to effect the movement of the displacing members and of the insulatin tubes by means of a common drive, this being to advantage effected in succession, and in one form of the invention being started from below by means of rackhars, spindles, gear-wheel transmissions or the like, from a readily accessible regulating rod. By means of this form of my invention, in the lifting of the regulating rod, the displacing members are first inserted wholly in the. insulating tubes, and thereafter the insulating tubes are lifted. In this way a very wide range of regulation may be obtained, and also an extremely fine and gradual regulation. In order not to interrupt suddenly, and therefore jerkily, the liquid resistance-path provided above the electrodes arranged in the insulatingstubes, the free ends of the insulating tubes are provided with an oblique surface of intersection with the liquid so that here also a very gradual transition is afforded.

One form of embodiment of the invention is shown by way of example of Figs. 1 and 2 of the drawing, in longitudinal section in various positions of the movable parts.

.teferring to the drawing, the electrodes 1: are insulated and arranged stationarily in the boiler b so as to! be immersed in the liquid to be heated. Over. each electrode a is placed an insulating tube d which is carried by the frames e and f. The frames e certain new and f are held a certain distance a art by the rods Passing through the me e and extending into the insulating tubes d are provided displacing members it of insulating material arranged on a common cross-piece i which in turn may be lifted and lowered by means of a rack-bar or spindle is by the cooperation of the gearwheel transmissions Z and m from the regulating rod n. The frames 6 and for the insulating tubes d,move on g'ui e rods 0- passing therethrough, and their movement is limited by the stops p and g which are attached to the boiler wall. In lifting the cross-piece 11:, therefore, the displacing members 7:. first enter the insulatin tubes at, as shown in Fig. 2, and reduce t e extent of the path of the liquid below the electrodes (L. Then the cross-piece i engages the lower frame e of the insulating tubes and upon further upward movement lifts the insulating tubes themselves, as shown in Fig. 1, so that then' the path of the liquidabove the electrodes at is gradually varied. In order to cause this upper liquid path to terminate very gradually, the upper free ends of the insulating tubes d are provided with oblique sectional surfaces 1".

In letting down the cross-pieced, the insulating tubes (Z, together with their frames 7 and e at first slide downward until they rest on the stops p and q, after which the cross-piece z', together with the displacement members 71, movesfarther downward so that the displacing members gradually slide out of the insulating tubes d.

What I claim as new and desire to secure by Letters Patent of the United States, is

1. An electric heater for liquids compristhe liquid to be heated, a movable insulating tube surrounding one of said electrodes, a movable insulating displacing member cooperating with the lower end of said tube, and a common actuating device arranged to sulating tubes surroun lift said member and said tube so as to'vary the liquid paths through the ends of said tube in succession.

3. An electric heater ior liquids comprising a plurality of electrodes immersed in the liquid to be heated, upright movable insulating tubes surrounding said electrodes, movable insulating displacing members adapted to be inserted in the lower ends of said tubes, and a common actuating device arranged to lift first said displacing. members and/then said tubes so as to vary the liquidpaths in succession through the lower and upper ends of said tubes. f

4. An electric heater for liquids comprising a plurality of electrodes immersed in the liquidto be heated, movable insulating tubes surrounding said electrodes, the upper ends of said tubes being oblique, movable insulating displacing members adapted to be inserted in the lower ends of said tubes, a common actuating device arranged to lift first said displacin members into said tubes and then said disp acing members and said tubes together so as to vary the liquid paths in succession through the lower and upper ends of said tubes.

5. An electric heater for liquids comprising a plurality of electrodes immersed into the liquid to be heated a plurality of inding said electrodes and providing upper and lower heating paths between said electrodes through the upper and lower ends of said tubes respectively, the upper ends of said tubes beingv oblique, displacing members adapted to be inserted in the lower ends of said tubes, and a common actuating device for lifting said displacing-members into said tubes so as to regulate said lower heating path, and then lifting said displacing members and said tubes together so as to regulate said upper heating path.

6. An electric heater for liquids compris-- the lower ends of said tubes, a support for said displacing members adapted to engage the support for said tubes after said displacing members have been lifted into said tube, and actuating mechanism for said displacing member support extending without the boiler, whereby said displacing members may be lifted to vary the liquid path through the lower ends of said tubes, after which said tubesmay be lifted with said displacing members to vary the liquid paths through the upper ends of said tubes.

In witness whereof, I have hereunto set my hand this 9th day of October, 1922.

' PAUL RAUCHF USS. 

